Abstract: GNSS is one of important sensors for accurate-control of tower crane. The low-accuracy of m-level positioning based on pseudo-range is not meeting the development requirements of intelligent tower crane. In order to improve the positioning accuracy of tower crane via GNSS techniques, a precise positioning method applied to positioning-point and setting-out based on GNSS carrier phase observation is proposed in this paper. It is applied to intelligent command for construction tower crane, and a set of GNSS-based positioning-point and setting-out system of hoisting operation (short as GNSS_PLS) is designed and developed. The preliminary experimental results show that the accuracy of intelligent command of GNSS_PLS system is in cm-level, which verifies the effectiveness of the algorithm.

Key words: GNSS accurate positioning, positioning-point and setting-out, hoisting operation, intelligent command, construction tower crane